Investigators are left with questions about how and why Abby Hernandez vanished after leaving her high school in Conway on Oct. 9 and who may have helped conceal her for so long. Law enforcement officers have repeatedly asked for the public’s help but have revealed very little.

A 15-year-old girl from Conway, New Hampshire who was missing for nine months is now back home with her family. But investigators are saying little about what led to the safe return of Abby Hernandez on Sunday.

“The facts and circumstances surrounding Abigail’s disappearance continue to be actively investigated,” said a statement from the New Hampshire Attorney General’s office. “Further details will be provided once it has been determined that releasing additional information will not compromise the integrity of the on-going criminal investigation.”